Welcome to Trouble Free Pool

We would like to welcome you to TFP, the webs leading Pool related website. We invite you to please Register to create a new account. Doing this will give you full access to the forums, where you will be able to receive personalized advice concerning your pool. We hope to see you soon!

DPD Powder bad

I try and keep my Taylor K2006 kit in a cool, dark, dry place but the Florida heat and humidity seems to have got the better of my DPD powder (not original, replacement from tftestkits). It's black and very clumpy. That shouldn't be a problem in itself, but this stuff sticks to the side of the measuring cylinder in spots. The FC test works fine, but I'm left with a spotty residue in the tube that will not remove come off or dissolve easily. I have to soak in bleach and scrub the tube to get it clean again.

It would be a shame to throw half a pot away, unless anyone knows a good removal chemical? I'll be putting an order in tomorrow whatever.